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• Haskell data serialization of some data implementing a common type class

  - by Evan

  Let's start with the following data A = A String deriving Show data B = B String deriving Show class X a where spooge :: a -> Q [ Some implementations of X for A and B ] Now let's say we have custom implementations of show and read, named show' and read' respectively which utilize Show as a serialization mechanism. I want show' and…

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• Determine the real type of file vb.net

  - by harold-sota

  I have a asp.net vb.net app, with a upload file control, when i upload the file i can get the type of file the extension : .(some thing), But if the user change the extension how i can get the real type of file? Any ideas??

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• Using <input type=file /> with J2EE/MySQL Backend

  - by Mark Hazlett

  Hey everyone, I'm wondering how I can hook up an input type=file to send a picture back to a backend servlet that will eventually be stored in a MySQL database as a BLOB? In other words, how can I upload a picture using the input and send that back to the servlet to insert into the database as a BLOB type? Thanks

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• Explain Type Classes in Haskell

  - by Tsubasa Gomamoto

  Hi, I am a C++ / Java programmer and the main paradigm I happen to use in everyday programming is OOP. In some thread I read a comment that Type classes are more intuitive in nature than OOP. Can someone explain the concept of type classes in simple words so that an OOP guy like me can understand it?

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• C error Array : array type has incomplete element type.

  - by ambika

  Hi my code extern int docx(char *,char[][]) // in a header file it is compiled in solaries properly. but in redhat linux it shows bellow error. array type has incomplete element type. i know i can solve it as - char[][20] is it the right way.

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• How to define type member constant in F# ?

  - by zproxy

  In C# one can define a type member constant like this: class Foo { public const int Bar = 600; } The IL shall looks like this. .field public static literal int32 Bar = int32(600) How can I do the same within Visual F# / FSharp? I tried this to no avail: [<Sealed>] type Foo() = [<Literal>] let Bar = 600

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• How to use input type="tel" in a contact form

  - by user1678664

  PHP newbie here trying to use a simple contact form. The fields I have are: "Name", "Email", "Phone", and "Message". I am trying to figure out what to do with the "Phone" field – I want it to output to the same place that "Message" does, so that when the email is received it will output both the message and the phone number to the body of the…

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• MySql TABLE data type

  - by Neil Aitken

  MS SQL Server has a TABLE data type which can be used in stored procedures, Does anybody know if MySQL has an equivalent data type? I've had a look over the docs but can't seem to find anything, so I presume it doesn't exist, but perhaps somebody has created a workaround

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• A simple question about type coercion in C++

  - by David

  Given a function prototype, and a type definition: int my_function(unsigned short x); typedef unsigned short blatherskite; Is the following situation defined by standard: int main(int argc, char** argv) { int result; blatherskite b; b=3; result = my_function(b); } Do I get type coercion predictably via the function prototype?

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• Java: select from collection only elements of provided type

  - by glaz666

  Hi! I have a collection of elements of type B and C, which all extends A. I need to filter the collection to get elements of only B type. Is there any way to do it except: for (A a : initCollection) { if (a instance of B) { newCollection.add(a)? } } Thanks

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• java mapping for oracle number type

  - by aauser

  I have database with oracle number type. Could there any possible issues with using java Double when updating table with numeric column. Should i switch BigDecimal or Double is approriate type. As I fas as I know, BigDecimal is used when arbitrary precision required, when deal with prices for example. Consider simple API updatePrice(Double…

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• C# Type Casting at Runtimefor Array.SetValue

  - by sprocketonline

  I'm trying to create an array using reflection, and insert values into it. I'm trying to do this for many different types so would like a createAndFillArray function capable of this : Type t1 = typeof(A); Type t2 = typeof(B); double exampleA = 22.5; int exampleB = 43; Array arrA = createAndFillArray(t1, exampleA); Array arrB =…

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• C++: get const or non-const reference type from trait

  - by maciekp

  I am writing a functor F which takes function of type void (*func)(T) and func's argument arg. Then functor F calls func with arg. I would like F not to copy arg, just to pass it as reference. But then I cannot simply write "void F(void (*func)(T), T&)" because T could be a reference. So I am trying to write a trait, which…

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• Interop type cannot be embedded

  - by Jan

  I am creating an web application on the .net 4.0 framework (beta2 ) in C#. When I try to use a assembly called "ActiveHomeScriptLib", I get the following error: Interop type 'ActiveHomeScriptLib.ActiveHomeClass' cannot be embedded. Use the applicable interface instead. When I change the framework to version 3.5, I…

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• Nullable type conversion in C#?

  - by dinesh

  Hi can we assign null value to struct type of variable? struct MyStruct { } MyStruct var = null; is this is possible in C# .net? if not ? then how C# is allowing Nullable < T struct type of variable can be assigned as null?

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• How to convert a PGresult to custom data type with libpq (PostgreSQL)

  - by mocopera

  Hi everyone! I'm using the libpq library in C to accessing my PostgreSQL database. So, when I do res = PQexec(conn, "SELECT point FROM test_point3d"); I don't know how to convert the PGresult I got to my custom data type. I know I can use the PQgetValue function, but again I don't know how to convert the returning string to…

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• how to specify the genric type in runtime

  - by santose

  I'm having a arraylist which I need to specify the type in runtime. ArrayList<String> alist = new ArrayList<String>(); I need to specify the type "String" at runtime. how can I do that. It should not be static.

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• F# compilation error: Unexpected type application

  - by Jim Burger

  In F#, given the following class: type Foo() = member this.Bar<'t> (arg0:string) = ignore() Why does the following compile: let f = new Foo() f.Bar<Int32> "string" While the following won't compile: let f = new Foo() "string" |> f.Bar<Int32> //The compiler returns the error: "Unexpected type…

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• how to use select type in Dropdownlist in C# without declaring as a list item

  - by superstar

  I guess this is simple, but i couldnot figure it out. i have a dropdown list with values America Asia Europe I need to the display the ddl as Select Type and when i click it, it should display the three values, but i should not use Select Type as a list item and it should not be displayed in the list. It should only…

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• Get drive type with SetupDiGetDeviceRegistryProperty

  - by new

  Dear all, I would like to know whether i can get the drive information using the SP_DEVICE_INTERFACE_DETAIL_DATA's DevicePath my device path looks like below "\?\usb#vid_04f2&pid_0111#5&39fe81e&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}" also please tell me in the winapi they say "To determine…

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• which data type i must choose for boolean type field??

  - by rima

  Hi I wanna create a Boolean field in my oracle table but I seen there is no boolean or byte data type so,which one of the oracle data type I must choose for a boolean value?

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• Hook perm for more than one content type

  - by Andrew

  Drupal 6.x I have this module that manages four different content types. For that matter, how do I define permission for each content within the same module? Is that even possible? I can't figure out how to define permission for each content type cuz hook_perm has to be named with module name and it doesn't have…

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• Possible to assign a data type to an anonymous type's members in a linq query?

  - by Abe Miessler

  If I have a linq query that creates the anonymous type below: select new { lf.id, lf.name, lf.desc, plf.childId }; Is it possible to assign a specific type…

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• converting an interface to a type in MVC

  - by danielovich

  Hi. I have a small isuse regarding an interface. Consider this code: [HttpPost()] public void Update(IAuctionItem item) { RedirectToAction("List"); } Whenever I call this I get an exception saying I can't create an instance of type which i totally correct. But is there a way of telling what the interface…

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• Get derived class type from a base's class static method

  - by Marco Bettiolo

  Hi, i would like to get the type of the derived class from a static method of its base class. How can this be accomplished? Thanks! class BaseClass { static void Ping () { Type t = this.GetType(); // should be DerivedClass, but it is not possible with a static method } } class DerivedClass :…

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